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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.awt;

import java.awt.image.Raster;
import java.awt.image.WritableRaster;

/**
 * The <code>CompositeContext</code> interface defines the encapsulated
 * and optimized environment for a compositing operation.
 * <code>CompositeContext</code> objects maintain state for
 * compositing operations.  In a multi-threaded environment, several
 * contexts can exist simultaneously for a single {@link Composite}
 * object.
 * <p>
 *  <code> CompositeContext </code>接口定义了合成操作的封装和优化环境。 <code> CompositeContext </code>对象维护合成操作的状态。
 * 在多线程环境中,单个{@link Composite}对象可以同时存在多个上下文。
 * 
 * 
 * @see Composite
 */

public interface CompositeContext {
    /**
     * Releases resources allocated for a context.
     * <p>
     *  释放为上下文分配的资源。
     * 
     */
    public void dispose();

    /**
     * Composes the two source {@link Raster} objects and
     * places the result in the destination
     * {@link WritableRaster}.  Note that the destination
     * can be the same object as either the first or second
     * source. Note that <code>dstIn</code> and
     * <code>dstOut</code> must be compatible with the
     * <code>dstColorModel</code> passed to the
     * {@link Composite#createContext(java.awt.image.ColorModel, java.awt.image.ColorModel, java.awt.RenderingHints) createContext}
     * method of the <code>Composite</code> interface.
     * <p>
     *  组合两个源{@link Raster}对象,并将结果放在目标{@link WritableRaster}中。请注意,目标可以是与第一个或第二个源相同的对象。
     * 注意,<code> dstIn </code>和<code> dstOut </code>必须与传递给{@link Composite#createContext(java.awt.image.ColorModel, java.awt.image.ColorModel,java.awt.RenderingHints)createContext}
     * 方法的<code> Composite </code>接口。
     * 
     * @param src the first source for the compositing operation
     * @param dstIn the second source for the compositing operation
     * @param dstOut the <code>WritableRaster</code> into which the
     * result of the operation is stored
     * @see Composite
     */
    public void compose(Raster src,
                        Raster dstIn,
                        WritableRaster dstOut);


}
